[llvm] [RISCV] Use policy instead of ForceTailAgnostic for vmsbf/vmsif/vmsof pseudos. (PR #127535)

[Craig Topper via llvm-commits]

topperc wrote:

> LGTM. (If we remove `ForceTailAgnostic`, there will be a bubble in TSFlags, should we compact it?)

If I'm able to remove `ForceTailAgnostic`, I will compact the TSFlags.

https://github.com/llvm/llvm-project/pull/127535